class TodoSniff

class TodoSniff implements Sniff {
    
    /**
     * A list of tokenizers this sniff supports.
     *
     * @var array
     */
    public $supportedTokenizers = [
        'PHP',
        'JS',
    ];
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return array_diff(Tokens::$commentTokens, Tokens::$phpcsCommentTokens);
    }
    
    //end register()
    
    /**
     * Processes this sniff, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token
     *                                               in the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        $content = $tokens[$stackPtr]['content'];
        $matches = [];
        preg_match('/(?:\\A|[^\\p{L}]+)todo([^\\p{L}]+(.*)|\\Z)/ui', $content, $matches);
        if (empty($matches) === false) {
            // Clear whitespace and some common characters not required at
            // the end of a to-do message to make the warning more informative.
            $type = 'CommentFound';
            $todoMessage = trim($matches[1]);
            $todoMessage = trim($todoMessage, '-:[](). ');
            $error = 'Comment refers to a TODO task';
            $data = [
                $todoMessage,
            ];
            if ($todoMessage !== '') {
                $type = 'TaskFound';
                $error .= ' "%s"';
            }
            $phpcsFile->addWarning($error, $stackPtr, $type, $data);
        }
    }
    
    //end process()

}